+++ /dev/null
-/***
- This file is part of avahi.
-
- avahi is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as
- published by the Free Software Foundation; either version 2.1 of the
- License, or (at your option) any later version.
-
- avahi is distributed in the hope that it will be useful, but WITHOUT
- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
- Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with avahi; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
- USA.
-***/
-
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
-
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
-#include <string.h>
-#include <sys/utsname.h>
-#include <unistd.h>
-#include <errno.h>
-#include <stdio.h>
-#include <assert.h>
-#include <stdlib.h>
-
-#include <avahi-common/domain.h>
-#include <avahi-common/timeval.h>
-#include <avahi-common/malloc.h>
-#include <avahi-common/error.h>
-
-#include "internal.h"
-#include "iface.h"
-#include "socket.h"
-#include "browse.h"
-#include "log.h"
-#include "util.h"
-#include "dns-srv-rr.h"
-#include "addr-util.h"
-#include "domain-util.h"
-#include "rr-util.h"
-
-#define AVAHI_DEFAULT_CACHE_ENTRIES_MAX 4096
-
-static void enum_aux_records(AvahiServer *s, AvahiInterface *i, const char *name, uint16_t type, void (*callback)(AvahiServer *s, AvahiRecord *r, int flush_cache, void* userdata), void* userdata) {
- assert(s);
- assert(i);
- assert(name);
- assert(callback);
-
- if (type == AVAHI_DNS_TYPE_ANY) {
- AvahiEntry *e;
-
- for (e = s->entries; e; e = e->entries_next)
- if (!e->dead &&
- avahi_entry_is_registered(s, e, i) &&
- e->record->key->clazz == AVAHI_DNS_CLASS_IN &&
- avahi_domain_equal(name, e->record->key->name))
- callback(s, e->record, e->flags & AVAHI_PUBLISH_UNIQUE, userdata);
-
- } else {
- AvahiEntry *e;
- AvahiKey *k;
-
- if (!(k = avahi_key_new(name, AVAHI_DNS_CLASS_IN, type)))
- return; /** OOM */
-
- for (e = avahi_hashmap_lookup(s->entries_by_key, k); e; e = e->by_key_next)
- if (!e->dead && avahi_entry_is_registered(s, e, i))
- callback(s, e->record, e->flags & AVAHI_PUBLISH_UNIQUE, userdata);
-
- avahi_key_unref(k);
- }
-}
-
-void avahi_server_enumerate_aux_records(AvahiServer *s, AvahiInterface *i, AvahiRecord *r, void (*callback)(AvahiServer *s, AvahiRecord *r, int flush_cache, void* userdata), void* userdata) {
- assert(s);
- assert(i);
- assert(r);
- assert(callback);
-
- /* Call the specified callback far all records referenced by the one specified in *r */
-
- if (r->key->clazz == AVAHI_DNS_CLASS_IN) {
- if (r->key->type == AVAHI_DNS_TYPE_PTR) {
- enum_aux_records(s, i, r->data.ptr.name, AVAHI_DNS_TYPE_SRV, callback, userdata);
- enum_aux_records(s, i, r->data.ptr.name, AVAHI_DNS_TYPE_TXT, callback, userdata);
- } else if (r->key->type == AVAHI_DNS_TYPE_SRV) {
- enum_aux_records(s, i, r->data.srv.name, AVAHI_DNS_TYPE_A, callback, userdata);
- enum_aux_records(s, i, r->data.srv.name, AVAHI_DNS_TYPE_AAAA, callback, userdata);
- } else if (r->key->type == AVAHI_DNS_TYPE_CNAME)
- enum_aux_records(s, i, r->data.cname.name, AVAHI_DNS_TYPE_ANY, callback, userdata);
- }
-}
-
-void avahi_server_prepare_response(AvahiServer *s, AvahiInterface *i, AvahiEntry *e, int unicast_response, int auxiliary) {
- assert(s);
- assert(i);
- assert(e);
-
- avahi_record_list_push(s->record_list, e->record, e->flags & AVAHI_PUBLISH_UNIQUE, unicast_response, auxiliary);
-}
-
-void avahi_server_prepare_matching_responses(AvahiServer *s, AvahiInterface *i, AvahiKey *k, int unicast_response) {
- assert(s);
- assert(i);
- assert(k);
-
- /* Push all records that match the specified key to the record list */
-
- if (avahi_key_is_pattern(k)) {
- AvahiEntry *e;
-
- /* Handle ANY query */
-
- for (e = s->entries; e; e = e->entries_next)
- if (!e->dead && avahi_key_pattern_match(k, e->record->key) && avahi_entry_is_registered(s, e, i))
- avahi_server_prepare_response(s, i, e, unicast_response, 0);
-
- } else {
- AvahiEntry *e;
-
- /* Handle all other queries */
-
- for (e = avahi_hashmap_lookup(s->entries_by_key, k); e; e = e->by_key_next)
- if (!e->dead && avahi_entry_is_registered(s, e, i))
- avahi_server_prepare_response(s, i, e, unicast_response, 0);
- }
-
- /* Look for CNAME records */
-
- if ((k->clazz == AVAHI_DNS_CLASS_IN || k->clazz == AVAHI_DNS_CLASS_ANY)
- && k->type != AVAHI_DNS_TYPE_CNAME && k->type != AVAHI_DNS_TYPE_ANY) {
-
- AvahiKey *cname_key;
-
- if (!(cname_key = avahi_key_new(k->name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_CNAME)))
- return;
-
- avahi_server_prepare_matching_responses(s, i, cname_key, unicast_response);
- avahi_key_unref(cname_key);
- }
-}
-
-static void withdraw_entry(AvahiServer *s, AvahiEntry *e) {
- assert(s);
- assert(e);
-
- /* Withdraw the specified entry, and if is part of an entry group,
- * put that into COLLISION state */
-
- if (e->dead)
- return;
-
- if (e->group) {
- AvahiEntry *k;
-
- for (k = e->group->entries; k; k = k->by_group_next)
- if (!k->dead) {
- avahi_goodbye_entry(s, k, 0, 1);
- k->dead = 1;
- }
-
- e->group->n_probing = 0;
-
- avahi_s_entry_group_change_state(e->group, AVAHI_ENTRY_GROUP_COLLISION);
- } else {
- avahi_goodbye_entry(s, e, 0, 1);
- e->dead = 1;
- }
-
- s->need_entry_cleanup = 1;
-}
-
-static void withdraw_rrset(AvahiServer *s, AvahiKey *key) {
- AvahiEntry *e;
-
- assert(s);
- assert(key);
-
- /* Withdraw an entry RRSset */
-
- for (e = avahi_hashmap_lookup(s->entries_by_key, key); e; e = e->by_key_next)
- withdraw_entry(s, e);
-}
-
-static void incoming_probe(AvahiServer *s, AvahiRecord *record, AvahiInterface *i) {
- AvahiEntry *e, *n;
- int ours = 0, won = 0, lost = 0;
-
- assert(s);
- assert(record);
- assert(i);
-
- /* Handle incoming probes and check if they conflict our own probes */
-
- for (e = avahi_hashmap_lookup(s->entries_by_key, record->key); e; e = n) {
- int cmp;
- n = e->by_key_next;
-
- if (e->dead)
- continue;
-
- if ((cmp = avahi_record_lexicographical_compare(e->record, record)) == 0) {
- ours = 1;
- break;
- } else {
-
- if (avahi_entry_is_probing(s, e, i)) {
- if (cmp > 0)
- won = 1;
- else /* cmp < 0 */
- lost = 1;
- }
- }
- }
-
- if (!ours) {
- char *t = avahi_record_to_string(record);
-
- if (won)
- avahi_log_debug("Received conflicting probe [%s]. Local host won.", t);
- else if (lost) {
- avahi_log_debug("Received conflicting probe [%s]. Local host lost. Withdrawing.", t);
- withdraw_rrset(s, record->key);
- }
-
- avahi_free(t);
- }
-}
-
-static int handle_conflict(AvahiServer *s, AvahiInterface *i, AvahiRecord *record, int unique) {
- int valid = 1, ours = 0, conflict = 0, withdraw_immediately = 0;
- AvahiEntry *e, *n, *conflicting_entry = NULL;
-
- assert(s);
- assert(i);
- assert(record);
-
- /* Check whether an incoming record conflicts with one of our own */
-
- for (e = avahi_hashmap_lookup(s->entries_by_key, record->key); e; e = n) {
- n = e->by_key_next;
-
- if (e->dead)
- continue;
-
- /* Check if the incoming is a goodbye record */
- if (avahi_record_is_goodbye(record)) {
-
- if (avahi_record_equal_no_ttl(e->record, record)) {
- char *t;
-
- /* Refresh */
- t = avahi_record_to_string(record);
- avahi_log_debug("Received goodbye record for one of our records [%s]. Refreshing.", t);
- avahi_server_prepare_matching_responses(s, i, e->record->key, 0);
-
- valid = 0;
- avahi_free(t);
- break;
- }
-
- /* If the goodybe packet doesn't match one of our own RRs, we simply ignore it. */
- continue;
- }
-
- if (!(e->flags & AVAHI_PUBLISH_UNIQUE) && !unique)
- continue;
-
- /* Either our entry or the other is intended to be unique, so let's check */
-
- if (avahi_record_equal_no_ttl(e->record, record)) {
- ours = 1; /* We have an identical record, so this is no conflict */
-
- /* Check wheter there is a TTL conflict */
- if (record->ttl <= e->record->ttl/2 &&
- avahi_entry_is_registered(s, e, i)) {
- char *t;
- /* Refresh */
- t = avahi_record_to_string(record);
-
- avahi_log_debug("Received record with bad TTL [%s]. Refreshing.", t);
- avahi_server_prepare_matching_responses(s, i, e->record->key, 0);
- valid = 0;
-
- avahi_free(t);
- }
-
- /* There's no need to check the other entries of this RRset */
- break;
-
- } else {
-
- if (avahi_entry_is_registered(s, e, i)) {
-
- /* A conflict => we have to return to probe mode */
- conflict = 1;
- conflicting_entry = e;
-
- } else if (avahi_entry_is_probing(s, e, i)) {
-
- /* We are currently registering a matching record, but
- * someone else already claimed it, so let's
- * withdraw */
- conflict = 1;
- withdraw_immediately = 1;
- }
- }
- }
-
- if (!ours && conflict) {
- char *t;
-
- valid = 0;
-
- t = avahi_record_to_string(record);
-
- if (withdraw_immediately) {
- avahi_log_debug("Received conflicting record [%s] with local record to be. Withdrawing.", t);
- withdraw_rrset(s, record->key);
- } else {
- assert(conflicting_entry);
- avahi_log_debug("Received conflicting record [%s]. Resetting our record.", t);
- avahi_entry_return_to_initial_state(s, conflicting_entry, i);
-
- /* Local unique records are returned to probing
- * state. Local shared records are reannounced. */
- }
-
- avahi_free(t);
- }
-
- return valid;
-}
-
-static void append_aux_callback(AvahiServer *s, AvahiRecord *r, int flush_cache, void* userdata) {
- int *unicast_response = userdata;
-
- assert(s);
- assert(r);
- assert(unicast_response);
-
- avahi_record_list_push(s->record_list, r, flush_cache, *unicast_response, 1);
-}
-
-static void append_aux_records_to_list(AvahiServer *s, AvahiInterface *i, AvahiRecord *r, int unicast_response) {
- assert(s);
- assert(r);
-
- avahi_server_enumerate_aux_records(s, i, r, append_aux_callback, &unicast_response);
-}
-
-void avahi_server_generate_response(AvahiServer *s, AvahiInterface *i, AvahiDnsPacket *p, const AvahiAddress *a, uint16_t port, int legacy_unicast, int immediately) {
-
- assert(s);
- assert(i);
- assert(!legacy_unicast || (a && port > 0 && p));
-
- if (legacy_unicast) {
- AvahiDnsPacket *reply;
- AvahiRecord *r;
-
- if (!(reply = avahi_dns_packet_new_reply(p, 512 + AVAHI_DNS_PACKET_EXTRA_SIZE /* unicast DNS maximum packet size is 512 */ , 1, 1)))
- return; /* OOM */
-
- while ((r = avahi_record_list_next(s->record_list, NULL, NULL, NULL))) {
-
- append_aux_records_to_list(s, i, r, 0);
-
- if (avahi_dns_packet_append_record(reply, r, 0, 10))
- avahi_dns_packet_inc_field(reply, AVAHI_DNS_FIELD_ANCOUNT);
- else {
- char *t = avahi_record_to_string(r);
- avahi_log_warn("Record [%s] not fitting in legacy unicast packet, dropping.", t);
- avahi_free(t);
- }
-
- avahi_record_unref(r);
- }
-
- if (avahi_dns_packet_get_field(reply, AVAHI_DNS_FIELD_ANCOUNT) != 0)
- avahi_interface_send_packet_unicast(i, reply, a, port);
-
- avahi_dns_packet_free(reply);
-
- } else {
- int unicast_response, flush_cache, auxiliary;
- AvahiDnsPacket *reply = NULL;
- AvahiRecord *r;
-
- /* In case the query packet was truncated never respond
- immediately, because known answer suppression records might be
- contained in later packets */
- int tc = p && !!(avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_FLAGS) & AVAHI_DNS_FLAG_TC);
-
- while ((r = avahi_record_list_next(s->record_list, &flush_cache, &unicast_response, &auxiliary))) {
-
- int im = immediately;
-
- /* Only send the response immediately if it contains a
- * unique entry AND it is not in reply to a truncated
- * packet AND it is not an auxiliary record AND all other
- * responses for this record are unique too. */
-
- if (flush_cache && !tc && !auxiliary && avahi_record_list_all_flush_cache(s->record_list))
- im = 1;
-
- if (!avahi_interface_post_response(i, r, flush_cache, a, im) && unicast_response) {
-
- /* Due to some reasons the record has not been scheduled.
- * The client requested an unicast response in that
- * case. Therefore we prepare such a response */
-
- append_aux_records_to_list(s, i, r, unicast_response);
-
- for (;;) {
-
- if (!reply) {
- assert(p);
-
- if (!(reply = avahi_dns_packet_new_reply(p, i->hardware->mtu, 0, 0)))
- break; /* OOM */
- }
-
- if (avahi_dns_packet_append_record(reply, r, flush_cache, 0)) {
-
- /* Appending this record succeeded, so incremeant
- * the specific header field, and return to the caller */
-
- avahi_dns_packet_inc_field(reply, AVAHI_DNS_FIELD_ANCOUNT);
- break;
- }
-
- if (avahi_dns_packet_get_field(reply, AVAHI_DNS_FIELD_ANCOUNT) == 0) {
- size_t size;
-
- /* The record is too large for one packet, so create a larger packet */
-
- avahi_dns_packet_free(reply);
- size = avahi_record_get_estimate_size(r) + AVAHI_DNS_PACKET_HEADER_SIZE;
-
- if (!(reply = avahi_dns_packet_new_reply(p, size + AVAHI_DNS_PACKET_EXTRA_SIZE, 0, 1)))
- break; /* OOM */
-
- if (avahi_dns_packet_append_record(reply, r, flush_cache, 0)) {
-
- /* Appending this record succeeded, so incremeant
- * the specific header field, and return to the caller */
-
- avahi_dns_packet_inc_field(reply, AVAHI_DNS_FIELD_ANCOUNT);
- break;
-
- } else {
-
- /* We completely fucked up, there's
- * nothing we can do. The RR just doesn't
- * fit in. Let's ignore it. */
-
- char *t;
- avahi_dns_packet_free(reply);
- reply = NULL;
- t = avahi_record_to_string(r);
- avahi_log_warn("Record [%s] too large, doesn't fit in any packet!", t);
- avahi_free(t);
- break;
- }
- }
-
- /* Appending the record didn't succeeed, so let's send this packet, and create a new one */
- avahi_interface_send_packet_unicast(i, reply, a, port);
- avahi_dns_packet_free(reply);
- reply = NULL;
- }
- }
-
- avahi_record_unref(r);
- }
-
- if (reply) {
- if (avahi_dns_packet_get_field(reply, AVAHI_DNS_FIELD_ANCOUNT) != 0)
- avahi_interface_send_packet_unicast(i, reply, a, port);
- avahi_dns_packet_free(reply);
- }
- }
-
- avahi_record_list_flush(s->record_list);
-}
-
-static void reflect_response(AvahiServer *s, AvahiInterface *i, AvahiRecord *r, int flush_cache) {
- AvahiInterface *j;
-
- assert(s);
- assert(i);
- assert(r);
-
- if (!s->config.enable_reflector)
- return;
-
- for (j = s->monitor->interfaces; j; j = j->interface_next)
- if (j != i && (s->config.reflect_ipv || j->protocol == i->protocol))
- avahi_interface_post_response(j, r, flush_cache, NULL, 1);
-}
-
-static void* reflect_cache_walk_callback(AvahiCache *c, AvahiKey *pattern, AvahiCacheEntry *e, void* userdata) {
- AvahiServer *s = userdata;
- AvahiRecord* r;
-
- assert(c);
- assert(pattern);
- assert(e);
- assert(s);
-
- /* Don't reflect cache entry with ipv6 link-local addresses. */
- r = e->record;
- if ((r->key->type == AVAHI_DNS_TYPE_AAAA) &&
- (r->data.aaaa.address.address[0] == 0xFE) &&
- (r->data.aaaa.address.address[1] == 0x80))
- return NULL;
-
- avahi_record_list_push(s->record_list, e->record, e->cache_flush, 0, 0);
- return NULL;
-}
-
-static void reflect_query(AvahiServer *s, AvahiInterface *i, AvahiKey *k) {
- AvahiInterface *j;
-
- assert(s);
- assert(i);
- assert(k);
-
- if (!s->config.enable_reflector)
- return;
-
- for (j = s->monitor->interfaces; j; j = j->interface_next)
- if (j != i && (s->config.reflect_ipv || j->protocol == i->protocol)) {
- /* Post the query to other networks */
- avahi_interface_post_query(j, k, 1, NULL);
-
- /* Reply from caches of other network. This is needed to
- * "work around" known answer suppression. */
-
- avahi_cache_walk(j->cache, k, reflect_cache_walk_callback, s);
- }
-}
-
-static void reflect_probe(AvahiServer *s, AvahiInterface *i, AvahiRecord *r) {
- AvahiInterface *j;
-
- assert(s);
- assert(i);
- assert(r);
-
- if (!s->config.enable_reflector)
- return;
-
- for (j = s->monitor->interfaces; j; j = j->interface_next)
- if (j != i && (s->config.reflect_ipv || j->protocol == i->protocol))
- avahi_interface_post_probe(j, r, 1);
-}
-
-static void handle_query_packet(AvahiServer *s, AvahiDnsPacket *p, AvahiInterface *i, const AvahiAddress *a, uint16_t port, int legacy_unicast, int from_local_iface) {
- size_t n;
- int is_probe;
-
- assert(s);
- assert(p);
- assert(i);
- assert(a);
-
- assert(avahi_record_list_is_empty(s->record_list));
-
- is_probe = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_NSCOUNT) > 0;
-
- /* Handle the questions */
- for (n = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_QDCOUNT); n > 0; n --) {
- AvahiKey *key;
- int unicast_response = 0;
-
- if (!(key = avahi_dns_packet_consume_key(p, &unicast_response))) {
- avahi_log_warn(__FILE__": Packet too short or invalid while reading question key. (Maybe a UTF-8 problem?)");
- goto fail;
- }
-
- if (!legacy_unicast && !from_local_iface) {
- reflect_query(s, i, key);
- if (!unicast_response)
- avahi_cache_start_poof(i->cache, key, a);
- }
-
- if (avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT) == 0 &&
- !(avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_FLAGS) & AVAHI_DNS_FLAG_TC))
- /* Allow our own queries to be suppressed by incoming
- * queries only when they do not include known answers */
- avahi_query_scheduler_incoming(i->query_scheduler, key);
-
- avahi_server_prepare_matching_responses(s, i, key, unicast_response);
- avahi_key_unref(key);
- }
-
- if (!legacy_unicast) {
-
- /* Known Answer Suppression */
- for (n = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT); n > 0; n --) {
- AvahiRecord *record;
- int unique = 0;
-
- if (!(record = avahi_dns_packet_consume_record(p, &unique))) {
- avahi_log_warn(__FILE__": Packet too short or invalid while reading known answer record. (Maybe a UTF-8 problem?)");
- goto fail;
- }
-
- avahi_response_scheduler_suppress(i->response_scheduler, record, a);
- avahi_record_list_drop(s->record_list, record);
- avahi_cache_stop_poof(i->cache, record, a);
-
- avahi_record_unref(record);
- }
-
- /* Probe record */
- for (n = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_NSCOUNT); n > 0; n --) {
- AvahiRecord *record;
- int unique = 0;
-
- if (!(record = avahi_dns_packet_consume_record(p, &unique))) {
- avahi_log_warn(__FILE__": Packet too short or invalid while reading probe record. (Maybe a UTF-8 problem?)");
- goto fail;
- }
-
- if (!avahi_key_is_pattern(record->key)) {
- if (!from_local_iface)
- reflect_probe(s, i, record);
- incoming_probe(s, record, i);
- }
-
- avahi_record_unref(record);
- }
- }
-
- if (!avahi_record_list_is_empty(s->record_list))
- avahi_server_generate_response(s, i, p, a, port, legacy_unicast, is_probe);
-
- return;
-
-fail:
- avahi_record_list_flush(s->record_list);
-}
-
-static void handle_response_packet(AvahiServer *s, AvahiDnsPacket *p, AvahiInterface *i, const AvahiAddress *a, int from_local_iface) {
- unsigned n;
-
- assert(s);
- assert(p);
- assert(i);
- assert(a);
-
- for (n = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT) +
- avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ARCOUNT); n > 0; n--) {
- AvahiRecord *record;
- int cache_flush = 0;
-
- if (!(record = avahi_dns_packet_consume_record(p, &cache_flush))) {
- avahi_log_warn(__FILE__": Packet too short or invalid while reading response record. (Maybe a UTF-8 problem?)");
- break;
- }
-
- if (!avahi_key_is_pattern(record->key)) {
-
- if (handle_conflict(s, i, record, cache_flush)) {
- if (!from_local_iface && !avahi_record_is_link_local_address(record))
- reflect_response(s, i, record, cache_flush);
- avahi_cache_update(i->cache, record, cache_flush, a);
- avahi_response_scheduler_incoming(i->response_scheduler, record, cache_flush);
- }
- }
-
- avahi_record_unref(record);
- }
-
- /* If the incoming response contained a conflicting record, some
- records have been scheduled for sending. We need to flush them
- here. */
- if (!avahi_record_list_is_empty(s->record_list))
- avahi_server_generate_response(s, i, NULL, NULL, 0, 0, 1);
-}
-
-static AvahiLegacyUnicastReflectSlot* allocate_slot(AvahiServer *s) {
- unsigned n, idx = (unsigned) -1;
- AvahiLegacyUnicastReflectSlot *slot;
-
- assert(s);
-
- if (!s->legacy_unicast_reflect_slots)
- s->legacy_unicast_reflect_slots = avahi_new0(AvahiLegacyUnicastReflectSlot*, AVAHI_LEGACY_UNICAST_REFLECT_SLOTS_MAX);
-
- for (n = 0; n < AVAHI_LEGACY_UNICAST_REFLECT_SLOTS_MAX; n++, s->legacy_unicast_reflect_id++) {
- idx = s->legacy_unicast_reflect_id % AVAHI_LEGACY_UNICAST_REFLECT_SLOTS_MAX;
-
- if (!s->legacy_unicast_reflect_slots[idx])
- break;
- }
-
- if (idx == (unsigned) -1 || s->legacy_unicast_reflect_slots[idx])
- return NULL;
-
- if (!(slot = avahi_new(AvahiLegacyUnicastReflectSlot, 1)))
- return NULL; /* OOM */
-
- s->legacy_unicast_reflect_slots[idx] = slot;
- slot->id = s->legacy_unicast_reflect_id++;
- slot->server = s;
-
- return slot;
-}
-
-static void deallocate_slot(AvahiServer *s, AvahiLegacyUnicastReflectSlot *slot) {
- unsigned idx;
-
- assert(s);
- assert(slot);
-
- idx = slot->id % AVAHI_LEGACY_UNICAST_REFLECT_SLOTS_MAX;
-
- assert(s->legacy_unicast_reflect_slots[idx] == slot);
-
- avahi_time_event_free(slot->time_event);
-
- avahi_free(slot);
- s->legacy_unicast_reflect_slots[idx] = NULL;
-}
-
-static void free_slots(AvahiServer *s) {
- unsigned idx;
- assert(s);
-
- if (!s->legacy_unicast_reflect_slots)
- return;
-
- for (idx = 0; idx < AVAHI_LEGACY_UNICAST_REFLECT_SLOTS_MAX; idx ++)
- if (s->legacy_unicast_reflect_slots[idx])
- deallocate_slot(s, s->legacy_unicast_reflect_slots[idx]);
-
- avahi_free(s->legacy_unicast_reflect_slots);
- s->legacy_unicast_reflect_slots = NULL;
-}
-
-static AvahiLegacyUnicastReflectSlot* find_slot(AvahiServer *s, uint16_t id) {
- unsigned idx;
-
- assert(s);
-
- if (!s->legacy_unicast_reflect_slots)
- return NULL;
-
- idx = id % AVAHI_LEGACY_UNICAST_REFLECT_SLOTS_MAX;
-
- if (!s->legacy_unicast_reflect_slots[idx] || s->legacy_unicast_reflect_slots[idx]->id != id)
- return NULL;
-
- return s->legacy_unicast_reflect_slots[idx];
-}
-
-static void legacy_unicast_reflect_slot_timeout(AvahiTimeEvent *e, void *userdata) {
- AvahiLegacyUnicastReflectSlot *slot = userdata;
-
- assert(e);
- assert(slot);
- assert(slot->time_event == e);
-
- deallocate_slot(slot->server, slot);
-}
-
-static void reflect_legacy_unicast_query_packet(AvahiServer *s, AvahiDnsPacket *p, AvahiInterface *i, const AvahiAddress *a, uint16_t port) {
- AvahiLegacyUnicastReflectSlot *slot;
- AvahiInterface *j;
-
- assert(s);
- assert(p);
- assert(i);
- assert(a);
- assert(port > 0);
- assert(i->protocol == a->proto);
-
- if (!s->config.enable_reflector)
- return;
-
- /* Reflecting legacy unicast queries is a little more complicated
- than reflecting normal queries, since we must route the
- responses back to the right client. Therefore we must store
- some information for finding the right client contact data for
- response packets. In contrast to normal queries legacy
- unicast query and response packets are reflected untouched and
- are not reassembled into larger packets */
-
- if (!(slot = allocate_slot(s))) {
- /* No slot available, we drop this legacy unicast query */
- avahi_log_warn("No slot available for legacy unicast reflection, dropping query packet.");
- return;
- }
-
- slot->original_id = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ID);
- slot->address = *a;
- slot->port = port;
- slot->interface = i->hardware->index;
-
- avahi_elapse_time(&slot->elapse_time, 2000, 0);
- slot->time_event = avahi_time_event_new(s->time_event_queue, &slot->elapse_time, legacy_unicast_reflect_slot_timeout, slot);
-
- /* Patch the packet with our new locally generatet id */
- avahi_dns_packet_set_field(p, AVAHI_DNS_FIELD_ID, slot->id);
-
- for (j = s->monitor->interfaces; j; j = j->interface_next)
- if (j->announcing &&
- j != i &&
- (s->config.reflect_ipv || j->protocol == i->protocol)) {
-
- if (j->protocol == AVAHI_PROTO_INET && s->fd_legacy_unicast_ipv4 >= 0) {
- avahi_send_dns_packet_ipv4(s->fd_legacy_unicast_ipv4, j->hardware->index, p, NULL, NULL, 0);
- } else if (j->protocol == AVAHI_PROTO_INET6 && s->fd_legacy_unicast_ipv6 >= 0)
- avahi_send_dns_packet_ipv6(s->fd_legacy_unicast_ipv6, j->hardware->index, p, NULL, NULL, 0);
- }
-
- /* Reset the id */
- avahi_dns_packet_set_field(p, AVAHI_DNS_FIELD_ID, slot->original_id);
-}
-
-static int originates_from_local_legacy_unicast_socket(AvahiServer *s, const AvahiAddress *address, uint16_t port) {
- assert(s);
- assert(address);
- assert(port > 0);
-
- if (!s->config.enable_reflector)
- return 0;
-
- if (!avahi_address_is_local(s->monitor, address))
- return 0;
-
- if (address->proto == AVAHI_PROTO_INET && s->fd_legacy_unicast_ipv4 >= 0) {
- struct sockaddr_in lsa;
- socklen_t l = sizeof(lsa);
-
- if (getsockname(s->fd_legacy_unicast_ipv4, (struct sockaddr*) &lsa, &l) != 0)
- avahi_log_warn("getsockname(): %s", strerror(errno));
- else
- return avahi_port_from_sockaddr((struct sockaddr*) &lsa) == port;
-
- }
-
- if (address->proto == AVAHI_PROTO_INET6 && s->fd_legacy_unicast_ipv6 >= 0) {
- struct sockaddr_in6 lsa;
- socklen_t l = sizeof(lsa);
-
- if (getsockname(s->fd_legacy_unicast_ipv6, (struct sockaddr*) &lsa, &l) != 0)
- avahi_log_warn("getsockname(): %s", strerror(errno));
- else
- return avahi_port_from_sockaddr((struct sockaddr*) &lsa) == port;
- }
-
- return 0;
-}
-
-static int is_mdns_mcast_address(const AvahiAddress *a) {
- AvahiAddress b;
- assert(a);
-
- avahi_address_parse(a->proto == AVAHI_PROTO_INET ? AVAHI_IPV4_MCAST_GROUP : AVAHI_IPV6_MCAST_GROUP, a->proto, &b);
- return avahi_address_cmp(a, &b) == 0;
-}
-
-static int originates_from_local_iface(AvahiServer *s, AvahiIfIndex iface, const AvahiAddress *a, uint16_t port) {
- assert(s);
- assert(iface != AVAHI_IF_UNSPEC);
- assert(a);
-
- /* If it isn't the MDNS port it can't be generated by us */
- if (port != AVAHI_MDNS_PORT)
- return 0;
-
- return avahi_interface_has_address(s->monitor, iface, a);
-}
-
-static void dispatch_packet(AvahiServer *s, AvahiDnsPacket *p, const AvahiAddress *src_address, uint16_t port, const AvahiAddress *dst_address, AvahiIfIndex iface, int ttl) {
- AvahiInterface *i;
- int from_local_iface = 0;
-
- assert(s);
- assert(p);
- assert(src_address);
- assert(dst_address);
- assert(iface > 0);
- assert(src_address->proto == dst_address->proto);
-
- if (!(i = avahi_interface_monitor_get_interface(s->monitor, iface, src_address->proto)) ||
- !i->announcing) {
- avahi_log_warn("Received packet from invalid interface.");
- return;
- }
-
- if (port <= 0) {
- /* This fixes RHBZ #475394 */
- avahi_log_warn("Received packet from invalid source port %u.", (unsigned) port);
- return;
- }
-
- if (avahi_address_is_ipv4_in_ipv6(src_address))
- /* This is an IPv4 address encapsulated in IPv6, so let's ignore it. */
- return;
-
- if (originates_from_local_legacy_unicast_socket(s, src_address, port))
- /* This originates from our local reflector, so let's ignore it */
- return;
-
- /* We don't want to reflect local traffic, so we check if this packet is generated locally. */
- if (s->config.enable_reflector)
- from_local_iface = originates_from_local_iface(s, iface, src_address, port);
-
- if (avahi_dns_packet_check_valid_multicast(p) < 0) {
- avahi_log_warn("Received invalid packet.");
- return;
- }
-
- if (avahi_dns_packet_is_query(p)) {
- int legacy_unicast = 0;
-
- /* For queries EDNS0 might allow ARCOUNT != 0. We ignore the
- * AR section completely here, so far. Until the day we add
- * EDNS0 support. */
-
- if (port != AVAHI_MDNS_PORT) {
- /* Legacy Unicast */
-
- if ((avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT) != 0 ||
- avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_NSCOUNT) != 0)) {
- avahi_log_warn("Invalid legacy unicast query packet.");
- return;
- }
-
- legacy_unicast = 1;
- }
-
- if (legacy_unicast)
- reflect_legacy_unicast_query_packet(s, p, i, src_address, port);
-
- handle_query_packet(s, p, i, src_address, port, legacy_unicast, from_local_iface);
-
- } else {
- char t[AVAHI_ADDRESS_STR_MAX];
-
- if (port != AVAHI_MDNS_PORT) {
- avahi_log_warn("Received response from host %s with invalid source port %u on interface '%s.%i'", avahi_address_snprint(t, sizeof(t), src_address), port, i->hardware->name, i->protocol);
- return;
- }
-
- if (ttl != 255 && s->config.check_response_ttl) {
- avahi_log_warn("Received response from host %s with invalid TTL %u on interface '%s.%i'.", avahi_address_snprint(t, sizeof(t), src_address), ttl, i->hardware->name, i->protocol);
- return;
- }
-
- if (!is_mdns_mcast_address(dst_address) &&
- !avahi_interface_address_on_link(i, src_address)) {
-
- avahi_log_warn("Received non-local response from host %s on interface '%s.%i'.", avahi_address_snprint(t, sizeof(t), src_address), i->hardware->name, i->protocol);
- return;
- }
-
- if (avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_QDCOUNT) != 0 ||
- avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT) == 0 ||
- avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_NSCOUNT) != 0) {
-
- avahi_log_warn("Invalid response packet from host %s.", avahi_address_snprint(t, sizeof(t), src_address));
- return;
- }
-
- handle_response_packet(s, p, i, src_address, from_local_iface);
- }
-}
-
-static void dispatch_legacy_unicast_packet(AvahiServer *s, AvahiDnsPacket *p) {
- AvahiInterface *j;
- AvahiLegacyUnicastReflectSlot *slot;
-
- assert(s);
- assert(p);
-
- if (avahi_dns_packet_check_valid(p) < 0 || avahi_dns_packet_is_query(p)) {
- avahi_log_warn("Received invalid packet.");
- return;
- }
-
- if (!(slot = find_slot(s, avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ID)))) {
- avahi_log_warn("Received legacy unicast response with unknown id");
- return;
- }
-
- if (!(j = avahi_interface_monitor_get_interface(s->monitor, slot->interface, slot->address.proto)) ||
- !j->announcing)
- return;
-
- /* Patch the original ID into this response */
- avahi_dns_packet_set_field(p, AVAHI_DNS_FIELD_ID, slot->original_id);
-
- /* Forward the response to the correct client */
- avahi_interface_send_packet_unicast(j, p, &slot->address, slot->port);
-
- /* Undo changes to packet */
- avahi_dns_packet_set_field(p, AVAHI_DNS_FIELD_ID, slot->id);
-}
-
-static void mcast_socket_event(AvahiWatch *w, int fd, AvahiWatchEvent events, void *userdata) {
- AvahiServer *s = userdata;
- AvahiAddress dest, src;
- AvahiDnsPacket *p = NULL;
- AvahiIfIndex iface;
- uint16_t port;
- uint8_t ttl;
-
- assert(w);
- assert(fd >= 0);
- assert(events & AVAHI_WATCH_IN);
-
- if (fd == s->fd_ipv4) {
- dest.proto = src.proto = AVAHI_PROTO_INET;
- p = avahi_recv_dns_packet_ipv4(s->fd_ipv4, &src.data.ipv4, &port, &dest.data.ipv4, &iface, &ttl);
- } else {
- assert(fd == s->fd_ipv6);
- dest.proto = src.proto = AVAHI_PROTO_INET6;
- p = avahi_recv_dns_packet_ipv6(s->fd_ipv6, &src.data.ipv6, &port, &dest.data.ipv6, &iface, &ttl);
- }
-
- if (p) {
- if (iface == AVAHI_IF_UNSPEC)
- iface = avahi_find_interface_for_address(s->monitor, &dest);
-
- if (iface != AVAHI_IF_UNSPEC)
- dispatch_packet(s, p, &src, port, &dest, iface, ttl);
- else
- avahi_log_error("Incoming packet received on address that isn't local.");
-
- avahi_dns_packet_free(p);
-
- avahi_cleanup_dead_entries(s);
- }
-}
-
-static void legacy_unicast_socket_event(AvahiWatch *w, int fd, AvahiWatchEvent events, void *userdata) {
- AvahiServer *s = userdata;
- AvahiDnsPacket *p = NULL;
-
- assert(w);
- assert(fd >= 0);
- assert(events & AVAHI_WATCH_IN);
-
- if (fd == s->fd_legacy_unicast_ipv4)
- p = avahi_recv_dns_packet_ipv4(s->fd_legacy_unicast_ipv4, NULL, NULL, NULL, NULL, NULL);
- else {
- assert(fd == s->fd_legacy_unicast_ipv6);
- p = avahi_recv_dns_packet_ipv6(s->fd_legacy_unicast_ipv6, NULL, NULL, NULL, NULL, NULL);
- }
-
- if (p) {
- dispatch_legacy_unicast_packet(s, p);
- avahi_dns_packet_free(p);
-
- avahi_cleanup_dead_entries(s);
- }
-}
-
-static void server_set_state(AvahiServer *s, AvahiServerState state) {
- assert(s);
-
- if (s->state == state)
- return;
-
- s->state = state;
-
- avahi_interface_monitor_update_rrs(s->monitor, 0);
-
- if (s->callback)
- s->callback(s, state, s->userdata);
-}
-
-static void withdraw_host_rrs(AvahiServer *s) {
- assert(s);
-
- if (s->hinfo_entry_group)
- avahi_s_entry_group_reset(s->hinfo_entry_group);
-
- if (s->browse_domain_entry_group)
- avahi_s_entry_group_reset(s->browse_domain_entry_group);
-
- avahi_interface_monitor_update_rrs(s->monitor, 1);
- s->n_host_rr_pending = 0;
-}
-
-void avahi_server_decrease_host_rr_pending(AvahiServer *s) {
- assert(s);
-
- assert(s->n_host_rr_pending > 0);
-
- if (--s->n_host_rr_pending == 0)
- server_set_state(s, AVAHI_SERVER_RUNNING);
-}
-
-void avahi_host_rr_entry_group_callback(AvahiServer *s, AvahiSEntryGroup *g, AvahiEntryGroupState state, AVAHI_GCC_UNUSED void *userdata) {
- assert(s);
- assert(g);
-
- if (state == AVAHI_ENTRY_GROUP_REGISTERING &&
- s->state == AVAHI_SERVER_REGISTERING)
- s->n_host_rr_pending ++;
-
- else if (state == AVAHI_ENTRY_GROUP_COLLISION &&
- (s->state == AVAHI_SERVER_REGISTERING || s->state == AVAHI_SERVER_RUNNING)) {
- withdraw_host_rrs(s);
- server_set_state(s, AVAHI_SERVER_COLLISION);
-
- } else if (state == AVAHI_ENTRY_GROUP_ESTABLISHED &&
- s->state == AVAHI_SERVER_REGISTERING)
- avahi_server_decrease_host_rr_pending(s);
-}
-
-static void register_hinfo(AvahiServer *s) {
- struct utsname utsname;
- AvahiRecord *r;
-
- assert(s);
-
- if (!s->config.publish_hinfo)
- return;
-
- if (s->hinfo_entry_group)
- assert(avahi_s_entry_group_is_empty(s->hinfo_entry_group));
- else
- s->hinfo_entry_group = avahi_s_entry_group_new(s, avahi_host_rr_entry_group_callback, NULL);
-
- if (!s->hinfo_entry_group) {
- avahi_log_warn("Failed to create HINFO entry group: %s", avahi_strerror(s->error));
- return;
- }
-
- /* Fill in HINFO rr */
- if ((r = avahi_record_new_full(s->host_name_fqdn, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_HINFO, AVAHI_DEFAULT_TTL_HOST_NAME))) {
-
- if (uname(&utsname) < 0)
- avahi_log_warn("uname() failed: %s\n", avahi_strerror(errno));
- else {
-
- r->data.hinfo.cpu = avahi_strdup(avahi_strup(utsname.machine));
- r->data.hinfo.os = avahi_strdup(avahi_strup(utsname.sysname));
-
- avahi_log_info("Registering HINFO record with values '%s'/'%s'.", r->data.hinfo.cpu, r->data.hinfo.os);
-
- if (avahi_server_add(s, s->hinfo_entry_group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, AVAHI_PUBLISH_UNIQUE, r) < 0) {
- avahi_log_warn("Failed to add HINFO RR: %s", avahi_strerror(s->error));
- return;
- }
- }
-
- avahi_record_unref(r);
- }
-
- if (avahi_s_entry_group_commit(s->hinfo_entry_group) < 0)
- avahi_log_warn("Failed to commit HINFO entry group: %s", avahi_strerror(s->error));
-
-}
-
-static void register_localhost(AvahiServer *s) {
- AvahiAddress a;
- assert(s);
-
- /* Add localhost entries */
- avahi_address_parse("127.0.0.1", AVAHI_PROTO_INET, &a);
- avahi_server_add_address(s, NULL, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, AVAHI_PUBLISH_NO_PROBE|AVAHI_PUBLISH_NO_ANNOUNCE, "localhost", &a);
-
- avahi_address_parse("::1", AVAHI_PROTO_INET6, &a);
- avahi_server_add_address(s, NULL, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, AVAHI_PUBLISH_NO_PROBE|AVAHI_PUBLISH_NO_ANNOUNCE, "ip6-localhost", &a);
-}
-
-static void register_browse_domain(AvahiServer *s) {
- assert(s);
-
- if (!s->config.publish_domain)
- return;
-
- if (avahi_domain_equal(s->domain_name, "local"))
- return;
-
- if (s->browse_domain_entry_group)
- assert(avahi_s_entry_group_is_empty(s->browse_domain_entry_group));
- else
- s->browse_domain_entry_group = avahi_s_entry_group_new(s, NULL, NULL);
-
- if (!s->browse_domain_entry_group) {
- avahi_log_warn("Failed to create browse domain entry group: %s", avahi_strerror(s->error));
- return;
- }
-
- if (avahi_server_add_ptr(s, s->browse_domain_entry_group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, 0, AVAHI_DEFAULT_TTL, "b._dns-sd._udp.local", s->domain_name) < 0) {
- avahi_log_warn("Failed to add browse domain RR: %s", avahi_strerror(s->error));
- return;
- }
-
- if (avahi_s_entry_group_commit(s->browse_domain_entry_group) < 0)
- avahi_log_warn("Failed to commit browse domain entry group: %s", avahi_strerror(s->error));
-}
-
-static void register_stuff(AvahiServer *s) {
- assert(s);
-
- server_set_state(s, AVAHI_SERVER_REGISTERING);
- s->n_host_rr_pending ++; /** Make sure that the state isn't changed tp AVAHI_SERVER_RUNNING too early */
-
- register_hinfo(s);
- register_browse_domain(s);
- avahi_interface_monitor_update_rrs(s->monitor, 0);
-
- assert(s->n_host_rr_pending > 0);
- s->n_host_rr_pending --;
-
- if (s->n_host_rr_pending == 0)
- server_set_state(s, AVAHI_SERVER_RUNNING);
-}
-
-static void update_fqdn(AvahiServer *s) {
- char *n;
-
- assert(s);
- assert(s->host_name);
- assert(s->domain_name);
-
- if (!(n = avahi_strdup_printf("%s.%s", s->host_name, s->domain_name)))
- return; /* OOM */
-
- avahi_free(s->host_name_fqdn);
- s->host_name_fqdn = n;
-}
-
-int avahi_server_set_host_name(AvahiServer *s, const char *host_name) {
- char *hn = NULL;
- assert(s);
-
- AVAHI_CHECK_VALIDITY(s, !host_name || avahi_is_valid_host_name(host_name), AVAHI_ERR_INVALID_HOST_NAME);
-
- if (!host_name)
- hn = avahi_get_host_name_strdup();
- else
- hn = avahi_normalize_name_strdup(host_name);
-
- hn[strcspn(hn, ".")] = 0;
-
- if (avahi_domain_equal(s->host_name, hn) && s->state != AVAHI_SERVER_COLLISION) {
- avahi_free(hn);
- return avahi_server_set_errno(s, AVAHI_ERR_NO_CHANGE);
- }
-
- withdraw_host_rrs(s);
-
- avahi_free(s->host_name);
- s->host_name = hn;
-
- update_fqdn(s);
-
- register_stuff(s);
- return AVAHI_OK;
-}
-
-int avahi_server_set_domain_name(AvahiServer *s, const char *domain_name) {
- char *dn = NULL;
- assert(s);
-
- AVAHI_CHECK_VALIDITY(s, !domain_name || avahi_is_valid_domain_name(domain_name), AVAHI_ERR_INVALID_DOMAIN_NAME);
-
- if (!domain_name)
- dn = avahi_strdup("local");
- else
- dn = avahi_normalize_name_strdup(domain_name);
-
- if (avahi_domain_equal(s->domain_name, domain_name)) {
- avahi_free(dn);
- return avahi_server_set_errno(s, AVAHI_ERR_NO_CHANGE);
- }
-
- withdraw_host_rrs(s);
-
- avahi_free(s->domain_name);
- s->domain_name = dn;
- update_fqdn(s);
-
- register_stuff(s);
-
- avahi_free(dn);
- return AVAHI_OK;
-}
-
-static int valid_server_config(const AvahiServerConfig *sc) {
- AvahiStringList *l;
-
- assert(sc);
-
- if (sc->n_wide_area_servers > AVAHI_WIDE_AREA_SERVERS_MAX)
- return AVAHI_ERR_INVALID_CONFIG;
-
- if (sc->host_name && !avahi_is_valid_host_name(sc->host_name))
- return AVAHI_ERR_INVALID_HOST_NAME;
-
- if (sc->domain_name && !avahi_is_valid_domain_name(sc->domain_name))
- return AVAHI_ERR_INVALID_DOMAIN_NAME;
-
- for (l = sc->browse_domains; l; l = l->next)
- if (!avahi_is_valid_domain_name((char*) l->text))
- return AVAHI_ERR_INVALID_DOMAIN_NAME;
-
- return AVAHI_OK;
-}
-
-static int setup_sockets(AvahiServer *s) {
- assert(s);
-
- s->fd_ipv4 = s->config.use_ipv4 ? avahi_open_socket_ipv4(s->config.disallow_other_stacks) : -1;
- s->fd_ipv6 = s->config.use_ipv6 ? avahi_open_socket_ipv6(s->config.disallow_other_stacks) : -1;
-
- if (s->fd_ipv6 < 0 && s->fd_ipv4 < 0)
- return AVAHI_ERR_NO_NETWORK;
-
- if (s->fd_ipv4 < 0 && s->config.use_ipv4)
- avahi_log_notice("Failed to create IPv4 socket, proceeding in IPv6 only mode");
- else if (s->fd_ipv6 < 0 && s->config.use_ipv6)
- avahi_log_notice("Failed to create IPv6 socket, proceeding in IPv4 only mode");
-
- s->fd_legacy_unicast_ipv4 = s->fd_ipv4 >= 0 && s->config.enable_reflector ? avahi_open_unicast_socket_ipv4() : -1;
- s->fd_legacy_unicast_ipv6 = s->fd_ipv6 >= 0 && s->config.enable_reflector ? avahi_open_unicast_socket_ipv6() : -1;
-
- s->watch_ipv4 =
- s->watch_ipv6 =
- s->watch_legacy_unicast_ipv4 =
- s->watch_legacy_unicast_ipv6 = NULL;
-
- if (s->fd_ipv4 >= 0)
- s->watch_ipv4 = s->poll_api->watch_new(s->poll_api, s->fd_ipv4, AVAHI_WATCH_IN, mcast_socket_event, s);
- if (s->fd_ipv6 >= 0)
- s->watch_ipv6 = s->poll_api->watch_new(s->poll_api, s->fd_ipv6, AVAHI_WATCH_IN, mcast_socket_event, s);
-
- if (s->fd_legacy_unicast_ipv4 >= 0)
- s->watch_legacy_unicast_ipv4 = s->poll_api->watch_new(s->poll_api, s->fd_legacy_unicast_ipv4, AVAHI_WATCH_IN, legacy_unicast_socket_event, s);
- if (s->fd_legacy_unicast_ipv6 >= 0)
- s->watch_legacy_unicast_ipv6 = s->poll_api->watch_new(s->poll_api, s->fd_legacy_unicast_ipv6, AVAHI_WATCH_IN, legacy_unicast_socket_event, s);
-
- return 0;
-}
-
-AvahiServer *avahi_server_new(const AvahiPoll *poll_api, const AvahiServerConfig *sc, AvahiServerCallback callback, void* userdata, int *error) {
- AvahiServer *s;
- int e;
-
- if (sc && (e = valid_server_config(sc)) < 0) {
- if (error)
- *error = e;
- return NULL;
- }
-
- if (!(s = avahi_new(AvahiServer, 1))) {
- if (error)
- *error = AVAHI_ERR_NO_MEMORY;
-
- return NULL;
- }
-
- s->poll_api = poll_api;
-
- if (sc)
- avahi_server_config_copy(&s->config, sc);
- else
- avahi_server_config_init(&s->config);
-
- if ((e = setup_sockets(s)) < 0) {
- if (error)
- *error = e;
-
- avahi_server_config_free(&s->config);
- avahi_free(s);
-
- return NULL;
- }
-
- s->n_host_rr_pending = 0;
- s->need_entry_cleanup = 0;
- s->need_group_cleanup = 0;
- s->need_browser_cleanup = 0;
- s->cleanup_time_event = NULL;
- s->hinfo_entry_group = NULL;
- s->browse_domain_entry_group = NULL;
- s->error = AVAHI_OK;
- s->state = AVAHI_SERVER_INVALID;
-
- s->callback = callback;
- s->userdata = userdata;
-
- s->time_event_queue = avahi_time_event_queue_new(poll_api);
-
- s->entries_by_key = avahi_hashmap_new((AvahiHashFunc) avahi_key_hash, (AvahiEqualFunc) avahi_key_equal, NULL, NULL);
- AVAHI_LLIST_HEAD_INIT(AvahiEntry, s->entries);
- AVAHI_LLIST_HEAD_INIT(AvahiGroup, s->groups);
-
- s->record_browser_hashmap = avahi_hashmap_new((AvahiHashFunc) avahi_key_hash, (AvahiEqualFunc) avahi_key_equal, NULL, NULL);
- AVAHI_LLIST_HEAD_INIT(AvahiSRecordBrowser, s->record_browsers);
- AVAHI_LLIST_HEAD_INIT(AvahiSHostNameResolver, s->host_name_resolvers);
- AVAHI_LLIST_HEAD_INIT(AvahiSAddressResolver, s->address_resolvers);
- AVAHI_LLIST_HEAD_INIT(AvahiSDomainBrowser, s->domain_browsers);
- AVAHI_LLIST_HEAD_INIT(AvahiSServiceTypeBrowser, s->service_type_browsers);
- AVAHI_LLIST_HEAD_INIT(AvahiSServiceBrowser, s->service_browsers);
- AVAHI_LLIST_HEAD_INIT(AvahiSServiceResolver, s->service_resolvers);
- AVAHI_LLIST_HEAD_INIT(AvahiSDNSServerBrowser, s->dns_server_browsers);
-
- s->legacy_unicast_reflect_slots = NULL;
- s->legacy_unicast_reflect_id = 0;
-
- s->record_list = avahi_record_list_new();
-
- /* Get host name */
- s->host_name = s->config.host_name ? avahi_normalize_name_strdup(s->config.host_name) : avahi_get_host_name_strdup();
- s->host_name[strcspn(s->host_name, ".")] = 0;
- s->domain_name = s->config.domain_name ? avahi_normalize_name_strdup(s->config.domain_name) : avahi_strdup("local");
- s->host_name_fqdn = NULL;
- update_fqdn(s);
-
- do {
- s->local_service_cookie = (uint32_t) rand() * (uint32_t) rand();
- } while (s->local_service_cookie == AVAHI_SERVICE_COOKIE_INVALID);
-
- if (s->config.enable_wide_area) {
- s->wide_area_lookup_engine = avahi_wide_area_engine_new(s);
- avahi_wide_area_set_servers(s->wide_area_lookup_engine, s->config.wide_area_servers, s->config.n_wide_area_servers);
- } else
- s->wide_area_lookup_engine = NULL;
-
- s->multicast_lookup_engine = avahi_multicast_lookup_engine_new(s);
-
- s->monitor = avahi_interface_monitor_new(s);
- avahi_interface_monitor_sync(s->monitor);
-
- register_localhost(s);
- register_stuff(s);
-
- return s;
-}
-
-void avahi_server_free(AvahiServer* s) {
- assert(s);
-
- /* Remove all browsers */
-
- while (s->dns_server_browsers)
- avahi_s_dns_server_browser_free(s->dns_server_browsers);
- while (s->host_name_resolvers)
- avahi_s_host_name_resolver_free(s->host_name_resolvers);
- while (s->address_resolvers)
- avahi_s_address_resolver_free(s->address_resolvers);
- while (s->domain_browsers)
- avahi_s_domain_browser_free(s->domain_browsers);
- while (s->service_type_browsers)
- avahi_s_service_type_browser_free(s->service_type_browsers);
- while (s->service_browsers)
- avahi_s_service_browser_free(s->service_browsers);
- while (s->service_resolvers)
- avahi_s_service_resolver_free(s->service_resolvers);
- while (s->record_browsers)
- avahi_s_record_browser_destroy(s->record_browsers);
-
- /* Remove all locally rgeistered stuff */
-
- while(s->entries)
- avahi_entry_free(s, s->entries);
-
- avahi_interface_monitor_free(s->monitor);
-
- while (s->groups)
- avahi_entry_group_free(s, s->groups);
-
- free_slots(s);
-
- avahi_hashmap_free(s->entries_by_key);
- avahi_record_list_free(s->record_list);
- avahi_hashmap_free(s->record_browser_hashmap);
-
- if (s->wide_area_lookup_engine)
- avahi_wide_area_engine_free(s->wide_area_lookup_engine);
- avahi_multicast_lookup_engine_free(s->multicast_lookup_engine);
-
- if (s->cleanup_time_event)
- avahi_time_event_free(s->cleanup_time_event);
-
- avahi_time_event_queue_free(s->time_event_queue);
-
- /* Free watches */
-
- if (s->watch_ipv4)
- s->poll_api->watch_free(s->watch_ipv4);
- if (s->watch_ipv6)
- s->poll_api->watch_free(s->watch_ipv6);
-
- if (s->watch_legacy_unicast_ipv4)
- s->poll_api->watch_free(s->watch_legacy_unicast_ipv4);
- if (s->watch_legacy_unicast_ipv6)
- s->poll_api->watch_free(s->watch_legacy_unicast_ipv6);
-
- /* Free sockets */
-
- if (s->fd_ipv4 >= 0)
- close(s->fd_ipv4);
- if (s->fd_ipv6 >= 0)
- close(s->fd_ipv6);
-
- if (s->fd_legacy_unicast_ipv4 >= 0)
- close(s->fd_legacy_unicast_ipv4);
- if (s->fd_legacy_unicast_ipv6 >= 0)
- close(s->fd_legacy_unicast_ipv6);
-
- /* Free other stuff */
-
- avahi_free(s->host_name);
- avahi_free(s->domain_name);
- avahi_free(s->host_name_fqdn);
-
- avahi_server_config_free(&s->config);
-
- avahi_free(s);
-}
-
-const char* avahi_server_get_domain_name(AvahiServer *s) {
- assert(s);
-
- return s->domain_name;
-}
-
-const char* avahi_server_get_host_name(AvahiServer *s) {
- assert(s);
-
- return s->host_name;
-}
-
-const char* avahi_server_get_host_name_fqdn(AvahiServer *s) {
- assert(s);
-
- return s->host_name_fqdn;
-}
-
-void* avahi_server_get_data(AvahiServer *s) {
- assert(s);
-
- return s->userdata;
-}
-
-void avahi_server_set_data(AvahiServer *s, void* userdata) {
- assert(s);
-
- s->userdata = userdata;
-}
-
-AvahiServerState avahi_server_get_state(AvahiServer *s) {
- assert(s);
-
- return s->state;
-}
-
-AvahiServerConfig* avahi_server_config_init(AvahiServerConfig *c) {
- assert(c);
-
- memset(c, 0, sizeof(AvahiServerConfig));
- c->use_ipv6 = 1;
- c->use_ipv4 = 1;
- c->allow_interfaces = NULL;
- c->deny_interfaces = NULL;
- c->host_name = NULL;
- c->domain_name = NULL;
- c->check_response_ttl = 0;
- c->publish_hinfo = 0;
- c->publish_addresses = 1;
- c->publish_no_reverse = 0;
- c->publish_workstation = 0;
- c->publish_domain = 1;
- c->use_iff_running = 0;
- c->enable_reflector = 0;
- c->reflect_ipv = 0;
- c->add_service_cookie = 0;
- c->enable_wide_area = 0;
- c->n_wide_area_servers = 0;
- c->disallow_other_stacks = 0;
- c->browse_domains = NULL;
- c->disable_publishing = 0;
- c->allow_point_to_point = 0;
- c->publish_aaaa_on_ipv4 = 1;
- c->publish_a_on_ipv6 = 0;
- c->n_cache_entries_max = AVAHI_DEFAULT_CACHE_ENTRIES_MAX;
- c->ratelimit_interval = 0;
- c->ratelimit_burst = 0;
-
- return c;
-}
-
-void avahi_server_config_free(AvahiServerConfig *c) {
- assert(c);
-
- avahi_free(c->host_name);
- avahi_free(c->domain_name);
- avahi_string_list_free(c->browse_domains);
- avahi_string_list_free(c->allow_interfaces);
- avahi_string_list_free(c->deny_interfaces);
-}
-
-AvahiServerConfig* avahi_server_config_copy(AvahiServerConfig *ret, const AvahiServerConfig *c) {
- char *d = NULL, *h = NULL;
- AvahiStringList *browse = NULL, *allow = NULL, *deny = NULL;
- assert(ret);
- assert(c);
-
- if (c->host_name)
- if (!(h = avahi_strdup(c->host_name)))
- return NULL;
-
- if (c->domain_name)
- if (!(d = avahi_strdup(c->domain_name))) {
- avahi_free(h);
- return NULL;
- }
-
- if (!(browse = avahi_string_list_copy(c->browse_domains)) && c->browse_domains) {
- avahi_free(h);
- avahi_free(d);
- return NULL;
- }
-
- if (!(allow = avahi_string_list_copy(c->allow_interfaces)) && c->allow_interfaces) {
- avahi_string_list_free(browse);
- avahi_free(h);
- avahi_free(d);
- return NULL;
- }
-
- if (!(deny = avahi_string_list_copy(c->deny_interfaces)) && c->deny_interfaces) {
- avahi_string_list_free(allow);
- avahi_string_list_free(browse);
- avahi_free(h);
- avahi_free(d);
- return NULL;
- }
-
- *ret = *c;
- ret->host_name = h;
- ret->domain_name = d;
- ret->browse_domains = browse;
- ret->allow_interfaces = allow;
- ret->deny_interfaces = deny;
-
- return ret;
-}
-
-int avahi_server_errno(AvahiServer *s) {
- assert(s);
-
- return s->error;
-}
-
-/* Just for internal use */
-int avahi_server_set_errno(AvahiServer *s, int error) {
- assert(s);
-
- return s->error = error;
-}
-
-uint32_t avahi_server_get_local_service_cookie(AvahiServer *s) {
- assert(s);
-
- return s->local_service_cookie;
-}
-
-static AvahiEntry *find_entry(AvahiServer *s, AvahiIfIndex interface, AvahiProtocol protocol, AvahiKey *key) {
- AvahiEntry *e;
-
- assert(s);
- assert(key);
-
- for (e = avahi_hashmap_lookup(s->entries_by_key, key); e; e = e->by_key_next)
-
- if ((e->interface == interface || e->interface <= 0 || interface <= 0) &&
- (e->protocol == protocol || e->protocol == AVAHI_PROTO_UNSPEC || protocol == AVAHI_PROTO_UNSPEC) &&
- (!e->group || e->group->state == AVAHI_ENTRY_GROUP_ESTABLISHED || e->group->state == AVAHI_ENTRY_GROUP_REGISTERING))
-
- return e;
-
- return NULL;
-}
-
-int avahi_server_get_group_of_service(AvahiServer *s, AvahiIfIndex interface, AvahiProtocol protocol, const char *name, const char *type, const char *domain, AvahiSEntryGroup** ret_group) {
- AvahiKey *key = NULL;
- AvahiEntry *e;
- int ret;
- char n[AVAHI_DOMAIN_NAME_MAX];
-
- assert(s);
- assert(name);
- assert(type);
- assert(ret_group);
-
- AVAHI_CHECK_VALIDITY(s, AVAHI_IF_VALID(interface), AVAHI_ERR_INVALID_INTERFACE);
- AVAHI_CHECK_VALIDITY(s, AVAHI_PROTO_VALID(protocol), AVAHI_ERR_INVALID_PROTOCOL);
- AVAHI_CHECK_VALIDITY(s, avahi_is_valid_service_name(name), AVAHI_ERR_INVALID_SERVICE_NAME);
- AVAHI_CHECK_VALIDITY(s, avahi_is_valid_service_type_strict(type), AVAHI_ERR_INVALID_SERVICE_TYPE);
- AVAHI_CHECK_VALIDITY(s, !domain || avahi_is_valid_domain_name(domain), AVAHI_ERR_INVALID_DOMAIN_NAME);
-
- if ((ret = avahi_service_name_join(n, sizeof(n), name, type, domain) < 0))
- return avahi_server_set_errno(s, ret);
-
- if (!(key = avahi_key_new(n, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_SRV)))
- return avahi_server_set_errno(s, AVAHI_ERR_NO_MEMORY);
-
- e = find_entry(s, interface, protocol, key);
- avahi_key_unref(key);
-
- if (e) {
- *ret_group = e->group;
- return AVAHI_OK;
- }
-
- return avahi_server_set_errno(s, AVAHI_ERR_NOT_FOUND);
-}
-
-int avahi_server_is_service_local(AvahiServer *s, AvahiIfIndex interface, AvahiProtocol protocol, const char *name) {
- AvahiKey *key = NULL;
- AvahiEntry *e;
-
- assert(s);
- assert(name);
-
- if (!s->host_name_fqdn)
- return 0;
-
- if (!(key = avahi_key_new(name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_SRV)))
- return 0;
-
- e = find_entry(s, interface, protocol, key);
- avahi_key_unref(key);
-
- if (!e)
- return 0;
-
- return avahi_domain_equal(s->host_name_fqdn, e->record->data.srv.name);
-}
-
-int avahi_server_is_record_local(AvahiServer *s, AvahiIfIndex interface, AvahiProtocol protocol, AvahiRecord *record) {
- AvahiEntry *e;
-
- assert(s);
- assert(record);
-
- for (e = avahi_hashmap_lookup(s->entries_by_key, record->key); e; e = e->by_key_next)
-
- if ((e->interface == interface || e->interface <= 0 || interface <= 0) &&
- (e->protocol == protocol || e->protocol == AVAHI_PROTO_UNSPEC || protocol == AVAHI_PROTO_UNSPEC) &&
- (!e->group || e->group->state == AVAHI_ENTRY_GROUP_ESTABLISHED || e->group->state == AVAHI_ENTRY_GROUP_REGISTERING) &&
- avahi_record_equal_no_ttl(record, e->record))
- return 1;
-
- return 0;
-}
-
-/** Set the wide area DNS servers */
-int avahi_server_set_wide_area_servers(AvahiServer *s, const AvahiAddress *a, unsigned n) {
- assert(s);
-
- if (!s->wide_area_lookup_engine)
- return avahi_server_set_errno(s, AVAHI_ERR_INVALID_CONFIG);
-
- avahi_wide_area_set_servers(s->wide_area_lookup_engine, a, n);
- return AVAHI_OK;
-}
-
-const AvahiServerConfig* avahi_server_get_config(AvahiServer *s) {
- assert(s);
-
- return &s->config;
-}
-
-/** Set the browsing domains */
-int avahi_server_set_browse_domains(AvahiServer *s, AvahiStringList *domains) {
- AvahiStringList *l;
-
- assert(s);
-
- for (l = s->config.browse_domains; l; l = l->next)
- if (!avahi_is_valid_domain_name((char*) l->text))
- return avahi_server_set_errno(s, AVAHI_ERR_INVALID_DOMAIN_NAME);
-
- avahi_string_list_free(s->config.browse_domains);
- s->config.browse_domains = avahi_string_list_copy(domains);
-
- return AVAHI_OK;
-}
projects / catta / blobdiff